System of transmission.



H. NEHLSEN.

SYSTEM OF TRANSMISSION.

APPLICATION FILED MAR. 20, 1911.

1,079,259, Patented Nov. 18, 1913.

Witnesses: Inventor:

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79.259g nam s-o or we sn Patented Nov. 13,1913. Application fled Inch, 1911. Serial {9. $15, 88. To it may comm: lnotor G. This torque motor does not ro- Be it known that I, Hnnmannbfnmu, a subject of the of Germany, residing at Berlin, Germany, have invented certain new and useful Improvements in Systems of Trans-mission, of which the follow-Z inglis a specification.

y invention relates to transmission sys-- terns and is alticuiarlyvappl icable rte-such a system in-w ich an inductionmotor drives a 1 source of direct current, and has for object to obtain a direct current voltage independent of the'speedof the source of direct To this end, my invention consists in certain features of novelty which are pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention and the advantages possessed by it, reierence may be had to the following descri-ption taken in connection with the. accompanying drawing, in which the single figure represents diagrammatically a transmission system arranged in aecordance with my inven'tion. 1

In the drawing, my invention is shown in connection with a fly wheel motor generatorset, in which an induction motor A, supplied from alternating current mains "0, drives'a fly Wheel B, "a direct current en- 1d a field winding (Z.

E represents a direct current motor su plied with current from the armataire of t e generator C, and e represents the field-windingof this motor. This motor E is mechanicaily connected to a load (not shown), which 1 it drives. I i

F represents an automatic rheostat-or slip regulator which is arran d to out the resistance into and out of e rotor circuit ofthe induction motor This slip regulator consists of a slip regulating or torque. motor G supplied current from a series transformer H which is inserted in the atlternating current mains a, and of a water rheostat I, the plates of which are separated rent which is shown as a generator having 1 tats but simply exerts a torque and is similar in-its action to a solenoid.

' A rotary transforming apparatus K, which I have chosen to show as a rotary converter having a field winding 70, is connected on its alternating current side to the rotor i j represents a control switch which is arranged to connect the generator field winding a across-the bus bars Z and to vary the current supplied to the generator field. The

f field wind-in s d oi the generator 1), the field winding 6 o the motor E and the field winding k of the rotary converter K are conpected in parallel across the bus bars '1. F In the drawing the switch M is shown in an operative position, in which part of the resistance as is in circuit with the field windng 6 of the generator 0. By moving the switch, more or less of the resistance m is placed in the field circuit. f

The current taken from the alternating current mains by the motor A of the fly wheel motor generator set is prevented from excoediin-gaa certain amount by means of the slip neguting device F. When the induction motor is H htly loaded the torque of mamene fly wheel B :to give .up some of its stored energy. ts the speed of the 1nduction motor stalls, the frequency and the lvdltage induced in the secondary of ther we n w a e we a piotor increase. Since the direct -current generator D,

, generator D is driven by the induction motor A, its speed falls and consequently its voltage, with the'decrease in speed of-the induction motor. Since the armature of the converter K is in series with the armature of the the sum of the voltages of these machines remains constant; that 1s, the voltage supplied to the bus bars Z remains constant, regardless of the variations in speed of the fly wheel motor generator set. v The output of the rotary converter depends upon the variations in speed of the induction motor, but in any case it 1s small compared with that of generator D. By overexciting this rotary converter, it may be employed at the same time to compensate for lagging power I desire it to be understood that my inventionis not limited to the specific arrangement of circuits shown and described, and I aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention What I claim as new and desire to secure by Letters Patent of the United States, is,-

1. In combination, an induct-ionmotor, a source of alternating motor, a separately excited generator cou-' pled to a fly wheel driven by said motor, a second generator driven by said motor, automatic means induction motor so as to permit the fly wheel to return energy to said source, and a rotary transforming apparatus connected on its alternating current side to the secondary member of the induction motor, the direct current side of the transforming apparatus being connected in series with said second genera-tor, said transforming apparatus and the second generator supplying the separate excitation for said first-mentioned generator.

2. In combination, an induction motor, a source of alternating current supplying said motor, a separately excited generator coupled to a fly wheel driven by said motor, automatic means for varying the speed of said induction motor so as to permit the fly wheel to return energy to said source, a direct current motor supplied by said generator, a second generator driven by said motor, and a rotary converter connected on its alternating current side to the secondary member of the induction motor, the direct current side of said rotary converter being connected in se ries with said second generator, said rotary converter and said second-generator supply- .ing separate e iicitation for said firstmentioned generator.

3. In combination, an induction motor, a

factor of the induction motor] current supplying-saidv for varying the speed of said stantially constant independent direct current generator driven by said motor, a rheostat in the secondary circuit of said motor, a rotary transforming apparatus connected on its alternating current side in parallel with said rheostat and on its direct current side in series with said generator.

4. In combination, an inductlon motor, a rheostat in the secondary circuit of said motor, a direct current generator driven by said motor, direct current mains, and a rota transforming apparatus connected on its a ternating current side in parallel with said rheostat, the direct current side of said transforming apparatus being connected in series with said direct current generator across said mains.

5. In combination, an induction motor, a rheostat in the secondary circuit of said mduction motor, a source of alternating current supplying said motor, direct current mains, a generator driven by said motor and supplying said mains, and means for automatically maintaining the potential of said mains independent of the speed of the induction motor comprising a rotary transforming apparatus connected on its alternating current sidein parallel with said rheostat and on its direct current'side in series with said generator across said direct current mains.

6. In combination, an induction motor, a source of alternating current supplying said motor, a separately excited generator, a fly wheel and a second generator driven by said motor, speed of said induction motor so as to permit the fly wheel to return energy to said source, direct current mains supp ying excitation to said separately excited generator, and means for automatically maintaining the potential of said mains substantially constant independent of the speed of the induction motor comprising a rotary transformer apparatus, said rotary transformer apparatus being connected on its alternating current side to the secondary member of the induction motor and on its direct current side in series with the said second nerator.

7. In .combination, a source of ternating current, a fl -wheel motor generator set comprising a irect current generator a flywheel and an induction motor, sai motor being connected-to said source, a rheostat for varying the speed of said induction motor so as to rmit the fly-wheel to return energy to' sai source, and means connected to the secondary circuit of saidniotor for maintaining the field of said generator subof the speed of said induction motor.

wheel and a second generator driven by said motor, a rheostat for varying the speed of said induction motor so as topermit the flywheel to return energy to said source, direct current main supplying excitation to sand separately excited generator, and means connected to'the'secondary circuit of sa 1d induction motor for automatically mamtainmg the potential of said mains substantially constant independent of the speed of said induction motor. 10 In witness whereof, I have hereunto set my hand this 24th da of Februar 1911.

'HER ANN NE LSEN. Witnesses:

CRISTIANO LARLI, 'WILHELM Wnnmm.

It is hereby certified that in Letters Patent No. 1,079,259, granted November 18, 1913, upon the application of Hermann N ehlsen, of Berlin, Germany, for an improve- I ment in Systems of Transmission, an error appears in the printed specification requiring correction as follows: Page 3, line 4, for the word main read mains,-

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 5th day of May, A. D., 1914.

J; T. NEWTON,

Acting Commissioner of Patents. 

